Quarterly report pursuant to Section 13 or 15(d)

Securitizations and Other Variable Interest Entities - First Lien Mortgages VIE (Details)

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Securitizations and Other Variable Interest Entities - First Lien Mortgages VIE (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
On-balance sheet assets      
Trading account assets $ 219,118 $ 209,358  
Debt securities carried at fair value 251,635 315,117  
Held-to-maturity securities 194,472 125,013  
Loans and leases, net 929,801 936,749  
All other assets 125,795 135,043  
Total assets 2,338,833 2,281,234 $ 2,284,174
Total liabilities 2,076,675 2,014,088  
Unpaid principal balance of mortgage loans eligible for repurchase 12 148  
Principal amount that would be payable to the securitization vehicles 12 148  
Unconsolidated VIEs | Agency      
Variable Interest Entity [Line Items]      
Maximum loss exposure 16,461 19,110  
On-balance sheet assets      
All other assets 0 10  
Total assets 16,461 19,110  
Principal balance outstanding 195,110 232,761  
Unconsolidated VIEs | Agency | Senior Lien      
On-balance sheet assets      
Trading account assets 509 716  
Debt securities carried at fair value 10,232 15,036  
Held-to-maturity securities 5,720 3,348  
Unconsolidated VIEs | Non-agency | Prime      
Variable Interest Entity [Line Items]      
Maximum loss exposure 458 689  
On-balance sheet assets      
All other assets 3 5  
Total assets 286 488  
Principal balance outstanding 9,448 10,549  
Unconsolidated VIEs | Non-agency | Prime | Senior Lien      
On-balance sheet assets      
Trading account assets 21 6  
Debt securities carried at fair value 262 477  
Held-to-maturity securities 0 0  
Unconsolidated VIEs | Non-agency | Subprime      
Variable Interest Entity [Line Items]      
Maximum loss exposure 2,063 2,643  
On-balance sheet assets      
All other assets 66 38  
Total assets 1,705 2,269  
Principal balance outstanding 9,156 10,254  
Unconsolidated VIEs | Non-agency | Subprime | Senior Lien      
On-balance sheet assets      
Trading account assets 47 10  
Debt securities carried at fair value 1,592 2,221  
Held-to-maturity securities 0 0  
Unconsolidated VIEs | Non-agency | Alt-A      
Variable Interest Entity [Line Items]      
Maximum loss exposure 218 403  
On-balance sheet assets      
All other assets 2 2  
Total assets 218 403  
Principal balance outstanding 24,439 28,129  
Unconsolidated VIEs | Non-agency | Alt-A | Senior Lien      
On-balance sheet assets      
Trading account assets 71 50  
Debt securities carried at fair value 145 351  
Held-to-maturity securities 0 0  
Unconsolidated VIEs | Commercial Mortgage      
Variable Interest Entity [Line Items]      
Maximum loss exposure 659 585  
On-balance sheet assets      
All other assets 44 88  
Total assets 520 470  
Principal balance outstanding 31,251 26,504  
Unconsolidated VIEs | Commercial Mortgage | Senior Lien      
On-balance sheet assets      
Trading account assets 57 108  
Debt securities carried at fair value 0 0  
Held-to-maturity securities 419 274  
Consolidated VIEs      
On-balance sheet assets      
Trading account assets 6,145 6,521  
Loans and leases, net 44,163 48,929  
All other assets 357 1,721  
Total assets 49,745 56,155  
Total liabilities 11,968 10,222  
Consolidated VIEs | Agency      
Variable Interest Entity [Line Items]      
Maximum loss exposure 13,206 14,502  
On-balance sheet assets      
Trading account assets 733 232  
Loans and leases, net 12,312 14,030  
All other assets 162 240  
Total assets 13,207 14,502  
Total liabilities 3 3  
Consolidated VIEs | Non-agency | Prime      
Variable Interest Entity [Line Items]      
Maximum loss exposure 551 571  
On-balance sheet assets      
Trading account assets 704 571  
Loans and leases, net 0 0  
All other assets 0 0  
Total assets 704 571  
Total liabilities 153 0  
Consolidated VIEs | Non-agency | Subprime      
Variable Interest Entity [Line Items]      
Maximum loss exposure 0 0  
On-balance sheet assets      
Trading account assets 0 0  
Loans and leases, net 0 0  
All other assets 0 0  
Total assets 0 0  
Total liabilities 0 0  
Consolidated VIEs | Non-agency | Alt-A      
Variable Interest Entity [Line Items]      
Maximum loss exposure 0 0  
On-balance sheet assets      
Trading account assets 0 0  
Loans and leases, net 0 0  
All other assets 0 0  
Total assets 0 0  
Total liabilities 0 0  
Consolidated VIEs | Commercial Mortgage      
Variable Interest Entity [Line Items]      
Maximum loss exposure 0 0  
On-balance sheet assets      
Trading account assets 0 0  
Loans and leases, net 0 0  
All other assets 0 0  
Total assets 0 0  
Total liabilities $ 0 $ 0